R3-NM1
P. 3 / 7
EM-8354 Rev.4
TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
INTERNAL
POWER
INTERNAL
COMM. BUS
DG
DB
DA
SLD
FG
To Other
Modbus
Devices
CONFIGURATION JACK
JACK
BUS CONNECTOR
*
Not provided with ‘No Power Supply’ type module.
1
4
2
3
6
FG
RUN
+
RUN
–
RUN CONTACT OUTPUT
U (+)
V (–)
POWER INPUT
*
WIRING INSTRUCTIONS
■
SOLDERLESS TERMINAL mm (inch)
Refer to the drawing below for recommended ring tongue
terminal size. Spade tongue type is also applicable. Solder-
less terminals with insulation sleeve do not fit. Applicable
wire size: 0.75 to 1.25 mm
2
3.2 (.13) dia.
4 min.
(.16)
12 (.47) max.
6 max. (.24)
3 (.12) max.
EXTERNAL DIMENSIONS
unit: mm (inch)
MODBUS WIRING
1
2
3
4
5
6
130 (5.12)
27.5 (1.08)
109 (4.29)
POSITIONING
GUIDE
TERMINAL
COVER
6–M3
SCREW
6.2 (.24)
TERMINATOR
Tx+ / Rx+
Tx– / Rx–
SG
Rx+
Rx–
HOST PC
DA
DB
DG
SLD
FG
R3-NM1
DA
DB
DG
SLD
FG
R3-NM1
FG
FG
• Main/Sub Switching Control
: SW3
The host PC or PLC can choose whether ‘Main’ or ‘Sub’ bus
is used when the switching control is set to ‘Host.’
In ‘Normal’ mode, ‘Main’ bus is normally used, while ‘Sub’
bus is when the main communication has failed.
Be sure to match this control mode for both network mod-
ules in dual communication mode.
• LED Function
: SW3
Functions assigned to the front RUN and ERR LEDs can
be selected.
SW3-4
LED
RUN
ERR
OFF (*)
Green when normal Green when abnormal
ON
Red when receiving
Red when transmitting
(*) Factory setting
MAIN/SUB SWITCHING CONTROL
Normal
(*)
Host
SW3-3
OFF
ON
